Wearing a black hoody, leggings and trainers, the 23-year-old singer looked visibly upset as she descended the stairs of her private jet, clutching a cuddly toy before being greeted by her boyfriend Mac Miller at Boca Raton airport in Florida.

Rapper Miller, whose real name is Malcolm James McCormick, embraced Grande with a big hug and a kiss on the tarmac before they were driven away in an awaiting car.

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She was due to perform at London's O2 Arena this Thursday and Friday, but as yet no decisions have been made about cancelling or postponing her performances.

Last night, reports by TMZ claimed that the singer had suspended her world tour indefinitely, but today, the O2's official Twitter revealed that no decision had been finalised and told fans they would be updated as soon as possible.

(Image: Twitter)

In a tweet, the official page for the venue said: “Ariana is due to perform at The O2 on Thursday and Friday and we will advise as soon as we can as to the status of those shows.”

Hours later, they added: “We are shocked and deeply saddened by the terrible tragedy in Manchester. Our thoughts and prayers are with those affected and their families.

"We are in contact with the promoters of Ariana Grande’s tour and will update as soon as we have further information regarding the planned dates at The O2.

"Anyone visiting The O2 should allow extra time for enhanced security checks."

US pop star Ariana Grande said she was 'broken' by the attack

Sources have also told Billboard that Ariana's team have yet to make a decision about the rest of her tour.

"Grande and her team are focused now on the victims and haven't assessed whether to play the remaining shows," Billboard reported.

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After Ariana's raw tweet this morning, fans quickly flooded her post with messages of support, insisting the attack was not the singer’s fault.

Celebrity blogger Perez Hilton assured her: “This is not your fault. Don't internalize any guilt. We are all hurting. Much love.”

Meanwhile, five of the 22 victims to have lost their lives in the terror attack have been named.

The first was a college student and Ariana superfan Georgina Callander, 18, who was studying health and social care in Lancashire.

Georgina had been pictured meeting with Ariana two years ago and spoke at the time of the joy she’d received talking to her idol. Actor Sean Maguire,and YouTubers Joe Sugg and Tyler Oakley had earlier paid tribute to Georgina, who they had also met in the past.

Eight-year-old Saffie Roussos and John Atkinson, 26, were named as the second and third victims to have died in the attack.

(Image: SWNS)

(Image: Facebook)

Saffie had gone to the concert with her older sister and mother but was not seen after the attack. Her parents had released a picture of her earlier in a desperate plea for help.

John has been described as an “amazing young man” and “beautiful” soul in tributes posted to social media.

15-year-old Olivia Campbell was also killed in the terror attack on Monday, her mother said on Tuesday night.